The UG suggested that WDS can be selected? Where?

You can use the utility of 8015p or 8030P, it is the best choice!

The LAN interface of AV 500 product is 100Mbps. Obviously you should change the other products, such as AV 1000 or AV 1200, if you want to better use your 200M broadband.

Red means Powerline network is in poor condition, maybe you should change another outlet or turn off some high-power electrical appliance.

As I know, Wifi clone is really hard to success even if you follow the instruction completely, it is not your device's problem. What's more, the power save function of PowerLine Extenders may be the...

As I know, the connection between PLCs work in differernt circuits can be established, but the speed would be affected seriously. Maybe you can borrow some PLCs from your friend to test.